You know that business about not judging a book by its cover — or, in the music equivalent, an indie-rock-looking band by its press photos? Ava Luna proves the truth of the old sentiment. At first glance, the New York septet appears bound to sound like Arcade Fire or Freelance Whales, but sonically, this septet bears little resemblance to those groups. Instead, it takes classic soul as an influence, combining that silky, sweet form with fluttering vocal harmonies from a trio of female singers and economical synthesizer lines. The entire product is treated with a most careful hand, showing off Ava Luna as the new royalty of sensual minimalism.